Everyone knows about GPS—technology that is used in modern devices for finding the exact location or paving the route. GPS is just one of the constellations among global satellite positioning systems or GNSS. There are other big systems: Russian GLONASS, European Galileo, and Chinese BeiDou.
This is a companion discussion topic for the original entry at https://community.robotshop.com/index.php/blog/show/introduction-to-precise-positioning-with-rtk-gnss